Brushless AC (BLAC) motors are driven with sinusoidal AC currents, and due to skewed magnets and sinusoidally distributed windings in their stators, they also produce sinusoidal back EMF. Sinusoidal commutation is a common way to control BLAC motors, as it provides a very consistent torque output with little torque ripple. But at high speeds, sinusoidal […]
Brushless Motors
Get the latest product news, technical info, and FAQs about brushless motors.
Direct-drive motors need direct-position sensing
by Mark Howard, Managing Director, Zettlex Direct drives differ from traditional drive arrangements. These motors impart many design advantages, but perform best with specialty feedback. Direct-drive motors have been around for a while, but only recently have OEMs and system integrators begun to leverage the advantages of this technology. Over the last few years, there’s […]
FAQ: What is trapezoidal back EMF?
The primary distinction between brushless DC (BLDC) motors and brushless AC (BLAC) motors is their back EMF waveform. BLDC motors typically have a trapezoidal back EMF, while BLAC motors (also referred to as permanent magnet synchronous motors, or PMSM) have a sinusoidal back EMF. The shape of a motor’s back EMF is important, because it […]
FAQ: What is sinusoidal back EMF with sinusoidal current?
Both brushless DC (BLDC) and brushless AC (BLAC) motors are permanent magnet, synchronous devices. They both produce torque and speed through the interaction of a rotating magnetic field in the stator and permanent magnets on the rotor. But while they have many similarities, differences in their stator construction produce different back EMF waveforms and result […]
FAQ: What are the different ways that industry classifies servo motors?
A servo system is one in which the system’s error (in position, speed, or torque) is corrected through the use of a feedback device that compares the system’s actual performance with its commanded performance. What makes a motor a servo motor, then, has less to do with its construction and operation, and more to do […]
Updated: Trends in electric motors Part IV — More on miniaturization and the special case of medical applications
There’s a general consensus that the medical industry currently looms largest for innovation in electric motors. That’s what many industry experts we recently interviewed told us. Here, the trend is towards designs that are smaller, lighter, more efficient and cheaper. “The need for portable medical devices is being driven by a more mobile aging population who need machines […]
Electric motor miniaturization, connectivity, and customization
Updated November 2019 ⚙️ Leading trends in electric motors for motion designs are migration to custom solutions; heightening emphasis on efficiency; and (where suitable) more use of motors that allow for miniaturization (with power-dense designs) and connectivity for IoT capabilities. “As reshoring picks up steam, we see more mass-customization,” said Scott Evans, director of product […]
New RPX-Series brushless dc motors from ElectroCraft
ElectroCraft, Inc. has expanded their brushless DC motor offering with the RPX22 and RPX32. These compact yet powerful 22-mm and 32-mm diameter motors are the first in a complete line of BLDC motors and gear motors planned for release. Starting at just 58 mm (2 in.) in length, the RPX range features high torque and high […]
New brushless DC slotted mini motors for surgical tools sterilizable, high-speed high-torque
Portescap is excited to announce the launch of application specific motors for surgical powered hand tools – arthroscopic shavers, ENT microdebriders and large bone drills. Prototypes will be available to ship within 3 weeks of order placement. Based on 20 years of experience in surgical motor design, application specific motors are designed to precise performance […]
Dunkermotoren’s new high-performance BLDC motors
Dunkermotoren USA has developed a family of high performance modular brushless permanent magnet motors driven by an integrated servo motor drive. The family is composed of 2.95 inch (75mm) squared high power density motors in 3 stack lengths. The family motor peak torque varies from 22.1 in-lb (BG75x25), to 44.2 in-lb (BG75x50), and up to […]
